package com.wpre.blogsystem.common.advice;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wpre.blogsystem.common.pojo.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * Created with IntelliJ IDEA.
 * Description: 统一返回结果
 * User: LianBao
 * Date: 2024-12-04
 * Time: 14:04
 */
@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {

    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if (body instanceof Result<?>) {
            return body;
        }

        //处理String类型,通常不返回String类型,需要转成json
        if (body instanceof String) {
            try {
                return objectMapper.writeValueAsString(Result.ok(body));
            } catch (JsonProcessingException e) {
                throw new RuntimeException(e);
            }
        }
        return Result.ok(body);
    }
}
